Question

which of the following is an ecosystem service? air pollution filtration machine seed disbursement soil erosion

Explanation:

Ecosystem services are benefits ecosystems provide. Air pollution (harmful) and soil erosion (harmful process) are not services. A filtration machine is human - made, not an ecosystem service. Seed dispersal is a natural process by ecosystems (e.g., animals, wind) aiding plant reproduction, so it's an ecosystem service.

Answer:

Seed disbursement (Note: Likely a typo, should be "Seed dispersal")